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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17ab42a803348d7368d65e846c0bb3d43a6692830472f10f8951e3fcf120e0fd' 
  AND token = 'DBoA3+oBcc0e0MSQGofukIly9aUWTkg6Dtp1yMTC7S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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