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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7f75f8fc844c1ef5b62cc2fa5d9cf9ca2ad43ec39141bc7a3f35da21bdbd715' 
  AND token = 'PZmNCKBpUEaPR5nRjWLNZ6KbM6s1VUk3Yeejm5SSg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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