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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '558c6bfdd82aac006b15b899159d67f49cc094fad0de40c94ec76469e66ad87c' 
  AND token = 'E9XyjvaLqoMpyacqHMjqVzO5ejE4CdCEgNZYGVNPkps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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