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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddddc4085f87bc89eb4aeabbfae39369339897cc7b40f0bfc8c65942ee6281b0' 
  AND token = 'O7Q8ZU6xJUuN2axmNzD/9A1W1QFN0VlCk2bPvBPdNpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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