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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318f2b586b3bb943ab9d241990c6473425aa224e7389da5492bbeb8be2e0e077' 
  AND token = 'WXlrXIeS0WqZ4B5Ws3rB7xSB+6zT2fxMMYBH54mqCko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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