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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a7e9217c4a6d07d902575688a50c7f46c96a28c271119aaf56ac0421c0e7196' 
  AND token = 'CquS6WTKQ3hhJZUCaE2Vqxi4shnj7JxAiaAM413rMKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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