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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0769ce5c35f24d21acb0f96ad00bd7645e7d4e1a3573cbfe15f725e56dbd97dc' 
  AND token = 'GZz7z2tDXKzJT6wO99zeimMfd86leHDaFMS/d5PQqrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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