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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3edc5c36951912f1a79aab4914ac49a9dfa45a1c1fba62128466eecfdef86ddd' 
  AND token = 'aBgPN9XlBQkbyyfr50m+Cz0FzUuKff2j67ByTCFSLUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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