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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b89c78ed6b92deec498c50fae6b7128ab4a688a37361a411d69d776862820c2' 
  AND token = 'uUcDy74n7ijLTUdi+0IkPRguyB2kzzMIq72dyG5bKf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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