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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '362c79f11a3c46d8ebb4241a5e6a430d89f5c85f53ff2efccfd039b43de12434' 
  AND token = 'zcc9yKsS3xQbV/6RNwccwlfU/OzKFSppmCrTOQPJXNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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