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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19b49c2c1742e5953fb75d6fbf75e05cd7d4eda2abcd6aae9d5302dc5fbdb2ef' 
  AND token = 'Ym7BaLL8NjHXLLiNr046KbmQYQbNLFQ3tahc8VsEsz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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