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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec4e62dc4c9e42f9632a48a51672ee0208b3a7f422722dea97b4a7f7c6787f07' 
  AND token = 'UvLyQKWy1OQ8CcyShVIBQbLGjpRJXf12sCeA/kPpX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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