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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f0ba2a52e67978d62c205b380e6e22d7d60f7b8e6e587b496b70f34deb29a45' 
  AND token = 'fVx+9Cb90o6AhCTwHHwDiCuFGS81m67IVzho9F0vf6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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