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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df97b2a8185baac30b022b8c3784b8ea03225539af9ada1bc449aa6936b5cac3' 
  AND token = 'skpaEikO9NmBCyXa2aJjtzXBs974rBjtM3LMBVjnTn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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