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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5344e60e6f2c187bad41b838c8daea5cddf87de818934781ee02c41a8aec202' 
  AND token = 'aKUaCJ3N97nM1AonnI8CFXB8mBX2fx+b+7WfIegpLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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