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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dbb7197b483f8ee8e8d2d3f5ba78794a19d43760a8e91ff10061a41f7681f80' 
  AND token = '5nWz/Pt4Vv+c6FiJ1l9F+LLGbbxEi8otjodsd6OjEEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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