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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d74c506eeb3de554ad6030258d691fcdd1ed4ac5300cc8ac6fba0bb9ebca452' 
  AND token = 'BAq//1dLpnaxP2l/RSEX4i+gODb7RLwe8JaOwQM4WLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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