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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec5a93bc7a9cfc59d3bf17f7765c2c54348b4271da3c0b1096506bc03023e6f8' 
  AND token = 'mfXdGkzTt4b06rMknF6Rna111tpFB2lqa8ntZIDM3C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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