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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40d01e893a59f1fa1318bd5df3c2d8b30393658e5099edf719472778f024875' 
  AND token = '66okMCn9HrWGYC3ANYHMH3yVUPhD8abA7H6dhkVlApM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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