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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea2cffd92ae81617ee6b7ddb276817fd7657062aac3de158c6fd74be6da96ee' 
  AND token = 'v13YXgq7Tt4zMNzer48NxNr3MYJ3dkTwbniemw4jt60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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