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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d31c1e61d8d6376024850859036474b0545e63769b700f4af30309f4433e614' 
  AND token = '3PPWm2dhtDeqJ8/emII/IpyXc2nWaqPoPc6noUzA1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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