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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158e538b56822e70c3ed04882dfe1bbf9b0d15ef397516e790c114115d6e7ad0' 
  AND token = 'LEnla4oLDIl/kWMcpdJq5gelejVlKknexmy1EzHxFKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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