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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb530ed324af4d2a0b062316a79de5ff8bb94fd09a1f31f17868ef1ee7e6986b' 
  AND token = 'NvNAG8ZVOOY5JHg57fx1HV7n7nNOD7xtRa8Xq4fx+MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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