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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a30fce61495a3780da9cfd77dc67b8ce592d889f77d32211ac5e750f04d70d1' 
  AND token = 'STolm6HGD3E+rYOf+RAAEAScL2+oMapRxZk8npTFiaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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