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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2587c34338aa01d1d50e11e8f7e0771e2f9bd8e4c6c2d9eec64b86372e9a7775' 
  AND token = 'Qsi/0vXDiLp7TI+ggAOOFVv8ijKV3JfrT8xsOIopCsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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