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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3dcbcb87d3db5fa6503e2fe2d785fef37c3eb8ade66ffebdf3f7a44d3d7d606' 
  AND token = 'elNCXBpIukvshZ3GRJHWUU/S7/ixYcyZY6ugTQ7txm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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