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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '604be4469965c3c2fdd88ccf9be8a5e19cd258002322013536c1542bc8aec73c' 
  AND token = 'h4LZyKxlYBUeg8ayTqaoEZT+mEFb84jp5QsTc0fNadQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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