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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '142cfc8d3c9850001bcb7220f2a4551e5c798f533bcd93fb00cb7b6384e84c6c' 
  AND token = 'ObETvKNNipW0V0ZXfMyhgRomSybVP+o00QQ8lFkGz1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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