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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a304ce6b0fd90e3199e05e8e84e0b70c06573dbaa42e8233a89f3ad5c19cb58' 
  AND token = 'odNVWcxCUC0Nfx1w6n6Xgskdpkeh9HW3cjDpAzh1MoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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