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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc563d76839b346ef66ef9ef41385c1c31a9be6b95accdbe6e216bcc4d9569d1' 
  AND token = 'YkuilzSvE6XnzkfiXzPHZLE3LMuHNisEppwiJweBYOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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