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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f30b386dcd5dcb72875123ca61b0ef7cea0820af4c4511fdacc95e1119d6fcb1' 
  AND token = 'oU9zDR5FzBK0Rm3ZfM4UK1UHSOI7G9SJJg47nhfzcBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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