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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a98dfb5b2686f1e038a83ca095b386df786c946053a49ce9e1afee1dae3ea2d' 
  AND token = 'ALIaG8a9yzlEtULmTkmmMx8dm6PKxjMM3llag3an/rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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