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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2505828265cc1c200e2340c5a6a6e80c4eec3529603c2bc3d63eba14cd7d2e67' 
  AND token = 'vEedbggW5DgOQRfoYfECngHRt1n1uETxonGNpht0eUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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