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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e578c4f270844fb1723a4ae0ccdbeb6dba8d4098e1e651486bdecc7da0246d' 
  AND token = 'L9Z1fI8s9C+1tj+DJ/Uc9BnGwtFH4tLem1eJKW5G2mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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