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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '984f08e26b8337daca40cd1bba2dd1d48e16d8c791a4b3d2f4fdee1042765358' 
  AND token = 'lJ5kgH0Ge+CRJ9RH20fj2XS1j56Rhtqnok+pTTncWhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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