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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '267fd0b0a2fa71cd770f712df480c6d8e358eec8ea3e58cde09aa2a9f9c4b72e' 
  AND token = '4La3MFy6N0tHbvfkPweOiU9XrNzpelERFIW0sUbE6Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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