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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f3f437c19d7e4ef76ba7a210d9407dff8613c4a5001dcdb9fd73781ab4dc4ce' 
  AND token = 'v2ob3P6yhY6NscaRlyCECq22Rsc0YnTgTAJso/iBSoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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