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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a137f0170d5a2719a1b0838e0dffd06827776ff9494dfb4c1561be28e5a80cfb' 
  AND token = 'yMiTa+P36FzbDDPyqVT6+yC3BfCC7WR4oP2UJcSak4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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