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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f7f46cb29fc8eee860335e3b1bdb0e34d00bf389003805be72f1ec7fc14d297' 
  AND token = 'pbuNFLpRTncYSK6m8oW10T7Ld3mGJJRJRNKcb+xVrOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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