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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637952c48c237694c4ce81e2cc0af4620ae1bfe4b1e91678117e56256757d487' 
  AND token = 'xoV6GNQF5eHz317i1OXyeWyt9AFayu8FwdfVQT9Q5tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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