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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a79c3e876f90b21e3a4d1bfefc8707e23849dae5612c2394386b10b2b7f35fc' 
  AND token = '7Gce9h0l8JeP+5SHESb+J0r2y3GmM+07TIpFCK/9rK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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