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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5f500b01acb2e501510bcfe65ce7ebb3d2aa7755251950c9d2a17d86a465b99' 
  AND token = 'r32mZb/hiPzcELJuiEeDJEAQaCYfKFT25XpTfYraaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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