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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fb916e6ef03be094a71a13b70c9b8564ef9fc1bb97d8e96e5df9c3282c74343' 
  AND token = 'lAMTGX8h/V/rP9eulUPMiPWk8J0zabRHFiC001HSZTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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