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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47576dd85a2606002c2d38b3d5ca6de6ab5c94899469659a8fd947b9d4e2e012' 
  AND token = 'cwLzLwfjHGFZpylxadAAihCZuf8fm7pY0ndbty1SMF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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