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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785aa19e6ecc4caee563ea7974029cbcbb45225507c454c32a24cabe6b2e1d69' 
  AND token = 'hCbPiTkFRScON7NFc9BVaYxPwHQb+sW3BLjQbLyc7Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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