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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c2f3cb924a36856a55d72c6a7befa5f93bfd3d622f6bdfa3a5cffec880a7f0' 
  AND token = 'zPxpKecquhucgfeNyo8BuhVdJrF3Z2g81eT+N9+XJaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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