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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cffe89fdbb97a22609b37fb1e032b2100cb2b6473e8bd87e6bda66f6312267b' 
  AND token = 'H7PK/qRrqHpbes6PjjM+b68KprMHKJ3DstjEoZFpdLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}